Wafer Bonding Chuck With Discrete Actuators for Alignment Control
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Solution Overview
Problem
Wafer-wafer bonding processes face challenges such as misalignment of bonding surfaces, leading to voids and reduced mechanical strength of semiconductor devices.
Innovation Solution
A wafer bonding tool with a chuck featuring discrete actuators that can independently displace to maintain alignment between semiconductor wafers during the bonding process, compensating for displacement caused by the bond wave.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bonding chuck contacts two semiconductor wafers during wafer bonding, then the bonding surfaces can be brought into contact to form interconnects and mechanically couple the wafers, but misalignment of the bonding surfaces can occur leading to voids and reduced mechanical strength
Solution Approach 1:
The patent applies dynamics by making the bonding chuck surface movable through discrete actuators that can independently displace to compensate for wafer displacement during bonding. The chuck transitions from a static to a dynamic system, allowing real-time adjustment of the bonding surface alignment to maintain precision despite process-induced movements.
Solution Approach 2:
The bonding chuck is segmented into multiple discrete actuators distributed across its surface, each capable of independent displacement. This segmentation allows localized control of different regions of the bonding surface, enabling precise compensation for non-uniform wafer displacement and maintaining alignment accuracy across the entire bonding interface.
2Manufacturing precision
If discrete actuators are added to the bonding chuck to maintain alignment, then localized control and bond quality improve, but device complexity increases
Solution Approach 1:
The discrete actuators are configured to automatically respond to wafer displacement during bonding, with each actuator independently adjusting its position based on local conditions. This self-service capability reduces the need for complex external control systems, as the actuators autonomously maintain alignment without requiring sophisticated coordination or feedback mechanisms.
Data Source
AI summary
A semiconductor wafer bonding tool is provided. The semiconductor wafer bonding tool can be used to perform a wafer-wafer bonding between a first semiconductor wafer and a second semiconductor wafer. The semiconductor wafer bonding tool includes a wafer bonding chuck configured to support a first semiconductor wafer at a first side. A plurality of discrete actuators are disposed at the first side of the wafer bonding chuck. Respective actuators of the plurality of discrete actuators are capable of displacing independently of one another. The respective actuators can be displaced based on one or more characteristics of the first semiconductor wafer or the second semiconductor wafer. In doing so, an improved wafer-wafer bonding process can be implemented.